747811947821 has 8 divisors (see below), whose sum is σ = 748127153280. Its totient is φ = 747496816992.

The previous prime is 747811947809. The next prime is 747811947877. The reversal of 747811947821 is 128749118747.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 747811947821 - 2¹⁰ = 747811946797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (747811977821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28228460 + ... + 28254938.

It is an arithmetic number, because the mean of its divisors is an integer number (93515894160).

Almost surely, 2^747811947821 is an apocalyptic number.

It is an amenable number.

747811947821 is a deficient number, since it is larger than the sum of its proper divisors (315205459).

747811947821 is a wasteful number, since it uses less digits than its factorization.

747811947821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37315.

The product of its digits is 6322176, while the sum is 59.

The spelling of 747811947821 in words is "seven hundred forty-seven billion, eight hundred eleven million, nine hundred forty-seven thousand, eight hundred twenty-one".